How to Build a Business Rules Engine

ness rules engine expands. As we shall see in subsequent chapters, one of the main

drivers to extend this design is increasingly complex rule types.

Column Entity

A Column entity is required to hold basic information about the columns that

contain data relevant to the business. In the sample application it is physically imple-

mented as a database table called COL_COLUMN_M. This follows the naming con-

ventions for tables discussed in the previous chapter. An immediate question for the

Column entity is if it should be a dependent entity of the Table entity—that is,

should there be an identifying relationship with Table as the parent and Column as

the child? If Column were made a dependent entity, this would mean making

the primary key of the Table ...